html {
    font-size: 10px;
}

header {
    font-size: 1.5rem;
    font-weight: 700;
}

#central {
    width: 30rem;
    height: 30rem;

    /* background: no-repeat center url("../img/icon.png");
    background-size: 100%; */

    background: radial-gradient(circle, yellow, pink, blue, purple);
    border-radius: 50%;
}

a {
    font-size: 12pt;
    line-height: 1;
    padding: 15px;
    position: relative;
    top: 50%;
    left: 29%;
}

a:hover {
    outline: 10px solid black;
}